TM 9-2350-247-20-1
COOLANT HEATER MALFUNCTIONS—Continued
0086 00
2FY
1. Replace heater ON/OFF/START switch (WP 0472 00).
2. Verify no faults found.
GY
1. Measure voltage between coolant pump to heater harness
terminal circuit 402B (1) on coolant pump and ground with
switch in start position.
2. Does multimeter read less than 17 volts?
YES
NO
GYN
1. Replace coolant heater pump
(WP 0478 00).
2. Verify no faults found.
2GY
1. Measure voltage between coolant pump to heater harness circuit
402B (1) on terminal strip (2) and ground with switch in start
position.
2. Does multimeter read less than 17 volts?
YES
NO
2GYN
1. Replace coolant pump to heater
harness (WP 0473 00).
2. Verify no faults found.
3GY
1. Replace coolant heater (WP 0477 00).
2. Verify no faults found.
0086 00-8
